JP2525761Y2 - Mold device for blow stage of injection blow molding machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding apparatus for a blow stage in an injection blow molding apparatus.
In particular, the present invention relates to a blow stage mold apparatus with an improved molded product discharge mechanism in a multi-cavity injection blow molding apparatus.

[0002]

2. Description of the Related Art FIG. 3 is an overall plan view of a conventional general injection blow molding machine. This injection blow molding machine includes an injection stage, a rotary stage, and a blowing stage. In this injection blow molding machine, the bottomed parison molded at the injection stage is moved to the blow stage side via the rotary stage and blow-molded in a mold device having a closed blow split mold that can be divided into two,
It becomes a molded product.

FIGS. 4 and 5 show the structure of a mold apparatus for a blow stage of a conventional injection blow molding machine.
11 and 21 are blown molded articles. Reference numerals 12 and 22 denote blow molds which can be divided to form a substantial side surface of the molded product, and open and close in the direction of the arrow. Reference numerals 13 and 23 denote bottom dies for molding most of the bottom of the molded product, which have suction / blow-down air passages 16 and 26 having suction and blow-down functions of the molded products 11 and 21. -At the tip of the blow-down air passages 16 and 26, suction and blow-down air ports 17 and
27. In particular, in the mold apparatus of FIG. 4, an ejector pin 15 for projecting a molded product is provided at the center of the bottom mold 13, and the ejector pin 15 is moved by the ejector plate 14. On the other hand, the mold apparatus of FIG. 5 has a core 28 at the center of the bottom mold 23.

A method of removing the molded products 11 and 21 from the mold device after blow molding in the mold device of such a blowing stage will be described. First, the core mold of the rotary stage is removed from the molded products 11 and 21. Next, the blow molds 12 and 22 of the mold device of the blow stage are opened, and the molded products 11 and 21 are discharged. When the molded products 11 and 21 are discharged, the bottom dies 13 and 23 are attached to the bottom dies 13 and 23 so that the molded products 11 and 21 do not stick to the blow dies 12 and 22 at the same time as the blow dies 12 and 22 are opened. The lower portions of the molded products 11 and 21 are vacuum-suctioned through the provided suction / blow-down air passages 16 and 26, and the molded products 11 and 21 are placed in the bottom dies 13 and 2.
3 and hold it.

When the blow split molds 12 and 22 are completely opened, the vacuum suction by the suction and blow down air passages 16 and 26 is switched to blow down air, and the molded products 11 and 21 are moved to the bottom mold 1.
The molded products 11 and 21 are separated from the substrates 3 and 23 and discharged and dropped. When the molded products 11 and 21 cannot be discharged by the blow-down air, the molded product 11 is used together with the blow-down air by using a mold device having a bottom mold 13 having an ejector pin 15 shown in FIG. Discharge.

[0006]

[Problem to be solved by the invention] In this conventional structure,
When the blow molding is performed in a perfect shape, the bottom of the molded product is in close contact with the bottom mold, and in such a state, the molded product is sucked into the bottom mold by vacuum suction from the bottom mold. Is held in. However, when blow molding is not performed in perfect form for some reason, for example, when the bottom corner of the molded product is incompletely blow molded, the effect of vacuum suction from the bottom mold is lost and the molded product Is insufficiently held by the bottom mold, falls off the bottom mold, or is taken to one of the blow molds when the mold is opened. In particular, in the case of a long molded article or a heavy molded article, the holding in the bottom mold becomes insufficient, and the molded article often comes off the bottom mold by its own weight.

Further, the case of multi-cavity molding will be described with reference to the mold apparatus of the blow stage shown in FIGS. 5, 6 and 7 as an example. FIG. 6 is a plan view showing a state in which the blow mold of the blow stage is opened, and FIG. 7 is a front view thereof. The timing at which the molded product 21 separates from the bottom mold 23 is
If not, the molded products 21 will collide with each other during the dropping from the top to the bottom between the multiple-piece blow-cutting dies 22, and will be disturbed. As a result, the mold may be caught by the blow mold 22 and the molding may be stopped. As a countermeasure against such a problem, even if the air is forcibly blown down with air from the top side between the blow molds 22, the molded product 21 drops in an orderly manner only by adjusting the air strength and timing. It is difficult to make
There was still a problem that the molded product 21 was sandwiched by the blow mold 22.

[0008] In the present invention, therefore, the present invention is directed to a method in which a multi-piece molded product is simultaneously discharged from the bottom mold, and can be smoothly and orderly and simultaneously dropped between the blow molds, whereby the molded product is caught in the blow mold. It is an object of the present invention to provide a mold device for a blowing stage in an injection blow molding machine without any.

[0009]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems by reliably holding the lower half of a molded product in a blow stage mold apparatus for performing blow molding in an injection blow molding machine. A bottom mold having a concave portion deep enough to hold, a split mold which can be opened and closed for forming the upper half of the molded product, and a molded product arranged in the bottom mold are extruded. And a mold device for a blowing stage.

[0010]

According to the present invention, since the bottom mold is formed with a deep recess capable of securely holding the lower half of the molded product as described above, the molded product of the blowing stage is formed by the mold. Even if the blow mold is opened when it is discharged from the apparatus, the molded product is securely held by the bottom mold and does not fall off. Then, by ejecting the ejector pins, the multi-cavity molded products are simultaneously discharged from the bottom mold of the mold apparatus and fall neatly between the blow molds, so that the molded products collide with each other or the molded products are blown. There is no collision with the mold, and the molded product does not flutter. Therefore, when the blow mold is closed in the next step, the molded product is not sandwiched.

[0011]

Embodiment 1 FIG. 1 shows a structure of a mold apparatus of a blow stage of an injection blow molding machine according to the present invention. FIG. 2 shows a state in which a multi-piece blow split mold is opened when a blow molded product is taken out from a die apparatus of a blow stage. Reference numeral 1 denotes a blown molded article. Reference numeral 2 denotes a split blow mold for forming the side surface of the upper half of the molded product 1, which can be opened and closed in the direction of the arrow. Reference numeral 3 denotes a fixed bottom die having a deep concave portion for molding most of the bottom portion of the molded product 1 and a lower half thereof. The air passage 6 has an air port 7 at the end of the air passage 6. Further, an ejector pin 5 for projecting a molded product is provided at the center of the bottom mold 3, and the ejector pin 5 is pressed by the ejector plate 4.

In the die apparatus of the blow stage for injection blow molding according to the present invention, a method of blow molding and removing the molded article 1 from the die apparatus of the blow stage after blow molding will be described. The bottomed parison 8 formed by the injection stage is transferred to the blowing stage by the rotary mold of the rotary stage. In this blowing stage, a bottom mold 3 and a blowable mold 2 that can be opened and closed in a closed state are combined. The bottom mold 3 and the blow mold 2 are covered with the bottomed parison 8. The core mold 9 is completely surrounded. By blowing air between the bottomed parison 8 and the core mold 9, the bottomed parison 8 is expanded by the blown air, and blow molding is performed.

Next, the core die 9 of the rotary stage is removed from the molded product 1. Next, as shown in FIG. 2, the blow split mold 2 of the blow stage die apparatus is opened in a direction perpendicular to the axis of the molded product 1. At this time, since the bottom mold 3 is formed with a deep concave portion which can securely hold the lower half portion of the molded product 1,
The molded article 1 is not taken to the blow mold 2 by opening and closing the blow mold 2.

When the blow mold 2 is completely opened, air is supplied to the air passage 6 and the ejector plate 4
As a result, the ejector pins 5 pushed out of the mold 1 push the molded article 1, so that a plurality of molded articles are simultaneously ejected from the multi-cavity mold device of the blowing stage.

[0015]

[Effects of the Invention] Since the present invention is configured as described above, a multi-piece molded product is simultaneously discharged from the bottom mold of the mold device by extrusion of the ejector pins, and the space between the blow molds is neatly arranged. As they fall, they may collide with each other,
The molded article does not collide with the blow mold and the molded article does not disturb. Therefore, when the blow mold is closed in the next step, the molded product is not sandwiched.

Further, according to the present invention, when the blow mold is opened, the molded article is securely held by the bottom mold, so that a vacuum suction device for holding the molded article is unnecessary in the present invention. It is. Furthermore, in the conventional mold structure, since the blow split mold forms most of the side of the molded product on the side surface of the molded product,
Although the parting line was formed on most of the side surface of the molded product and the printing characteristics were poor, according to the blow stage mold apparatus of the present invention, the part molded by the bottom mold of the lower half of the molded product was: Since there is no parting line, printing characteristics are improved.

According to the present invention, when the blow mold is opened, the molded product is securely held by the bottom mold, and the ejector pins push the molded product, so that the molded product is not left behind.
When the mold device of the blow stage of the present invention was moved, there was no accident that the product was caught in the blow mold during molding.
No problem with continuous operation.

[Brief description of the drawings]

FIG. 1 shows a structure of a mold apparatus of a blow stage of an injection blow molding machine according to the present invention.

FIG. 2 shows a state in which a multi-piece blow split mold is opened when a blow-molded product according to the present invention is taken out from a die apparatus of a blow stage.

FIG. 3 is an overall plan view of a conventional general injection blow molding machine.

FIG. 4 shows a structure of a mold device of a blow stage of a conventional injection blow molding machine.

FIG. 5 shows a structure of a mold apparatus of another conventional blow stage of an injection blow molding machine.

FIG. 6 is a plan view showing a state in which a blow split mold of a blow stage is opened.

FIG. 7 shows a front view of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molded product 2 Blowing mold 3 Bottom mold 4 Ejector plate 5 Ejector pin 6 Air passage 7 Air port 8 Bottom parison 9 Core mold

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Harada One of 731 Naganumahara-cho, Chiba City, Chiba Prefecture Sumitomo Heavy Industries, Ltd. Chiba Works

Claims (1)

(57) [Scope of request for utility model registration] 1. A mold device for a blow stage for performing blow molding in an injection blow molding machine, wherein a bottom having a deep recess formed so as to form a lower half portion of the molded product and securely hold the molded product. A mold and a blowable split mold that can be opened and closed separately for molding the upper half of the molded product;
A mold device for a blowing stage, comprising: an ejector pin for extruding a molded product arranged in the bottom mold.